CN109253252A - Piston gas ring and piston component with frizing, oil return function - Google Patents
Piston gas ring and piston component with frizing, oil return function Download PDFInfo
- Publication number
- CN109253252A CN109253252A CN201811041491.9A CN201811041491A CN109253252A CN 109253252 A CN109253252 A CN 109253252A CN 201811041491 A CN201811041491 A CN 201811041491A CN 109253252 A CN109253252 A CN 109253252A
- Authority
- CN
- China
- Prior art keywords
- oil
- piston
- main body
- annulus
- recovery tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
- F16J9/20—Rings with special cross-section; Oil-scraping rings
Abstract
The present invention relates to a kind of band frizings, the piston gas ring and piston component of oil return function, piston groove is equipped on piston, piston gas ring is mounted in piston groove, piston gas ring includes the annulus main body with opening, the outer circumference surface of annulus main body has the sealing edge that sealing cooperation is contacted with casing wall, axially the upper one end end face adaptable with sealing edge direction is equipped with the oil-recovery tank radially extended to the cylindrical main body, the oil-recovery tank is axially toward port and the annulus inner major diameter hole connection of annulus inner major diameter side, the port that oil-recovery tank is axially toward annulus body outer diameter side terminates in the interior radial side of sealing edge and composition sealing edge is circumferentially continuous along the outer circumference surface of annulus main body in turn with sealing edge interval, settable step groove or nose-shaped slot are for being connected oil-recovery tank and sealing edge between oil-recovery tank and sealing edge.Piston gas ring band oil-returning structure of the invention, so that compression ring has both oil return, frizing and sealing performance, with simple, the vdiverse in function advantage of structure.
Description
Technical field
The present invention relates to piston gas ring and piston components.
Background technique
Piston ring (Piston Ring) is a kind of with the larger metallic elastic ring for expanding outwardly deformation, is embedded in piston groove
Inside ditch；Piston ring is divided into two kinds: compression ring (compression ring) and machine oil ring (oil ring).Reciprocal and rotary motion piston gas ring, according to
By the pressure difference of gas or liquid, sealing is formed between ring periphery and a side of cylinder and ring and annular groove.
It is applied in combination on existing piston using oil ring and compression ring, compression ring is mounted on upper piston area position, and oil ring is arranged in work
The lower position of plug.It is to control the consumption of lubricating oil that oil piston ring, which undertakes main effect, and in piston stroking upward, oil ring can be
One layer of uniform oil film on cloth, guarantees enough lubrications on cylinder wall, and when piston downlink, it is extra that oil ring can scrape cylinder wall
Lubricating oil；And compression ring mainly seals.Since the gentle ring function of oil ring requires difference, for compression ring and oil ring technique
Different with the requirements such as structure, if compression ring is thinner compared with oil ring, the sealing edge of compression ring outer circumferential sides is in casing wall contact width compared with oil ring
Scrap blade and casing wall contact width it is wider, the lower position that oil ring is mounted on piston uses, and compression ring is installed on piston middle and upper part
Position.At present when considering piston component oil return, frizing function, research direction focuses mostly on to be changed in the structure on oil piston ring
Into, and do not have oil-returning structure on the compression ring for using on piston.
Summary of the invention
Objects of the present invention: to overcome defect of the existing technology, the present invention provides one kind and is provided with oil-returning structure,
Piston gas ring with frizing, oil return function has structure simply excellent so that compression ring has both oil return, frizing and sealing performance
Point.
To achieve the above object, the present invention provides the following technical scheme that
A kind of piston gas ring with frizing, oil return function, including the annulus main body with opening, the outer circumference surface of annulus main body has
The sealing edge of sealing cooperation is contacted with casing wall, it is characterised in that: the cylindrical main body is axially upper mutually to fit with sealing edge direction
One end end face answered is equipped with the oil-recovery tank that radially extends, the oil-recovery tank be axially toward the port of annulus inner major diameter side with
Annulus inner major diameter hole connection, the port that oil-recovery tank is axially toward annulus body outer diameter side terminate in the interior radial side of sealing edge simultaneously
It is circumferentially continuous along the outer circumference surface of annulus main body to constitute sealing edge in turn with sealing edge interval.
The present invention breaks the structure design that traditional compression ring is served only for sealing function, and oil-recovery tank is opened up on compression ring end face, close
Edge sealing and oil-recovery tank cooperate, and sealing edge flows back after scraping to the oil on casing wall through oil-recovery tank, and oil-recovery tank can be adapted to preferably
Compression ring thin structure feature, the port and sealing edge interval of the outside diameter of oil-recovery tank, so that it is close to avoid the processing of oil-recovery tank from destroying
Edge sealing guarantees the continuous of sealing edge, guarantees the reliability of compression ring sealing.
Preferably, annular is equipped at the interval location between the oil-recovery tank and sealing edge is connected groove, and the linking is recessed
Slot radially inner side and oil-recovery tank connection, the outer radial side of connecting groove have circumferentially continuous, smooth with sealing edge along annulus main body
Transition connects and composes sealing edge along the circumferentially continuous linking end face of annulus main body outer circumference surface.Under structure design, so that sealing
While the lubricating oil scraped easier can enter in oil-recovery tank, oil return effect is improved, while being connected the design of groove, be convenient for oil return
The processing of slot and sealing edge is formed.
Preferably, the connecting groove is cricoid step groove, and the axially extending periphery of step groove is located at internal side diameter, oil return
The axially extending periphery that slot length direction Single port penetrates through step groove is constituted and step groove connection, the axial end face structure of step groove
At the linking end face.It is designed using step groove, structure is simple, easy to process.
Preferably, the axial dimension of the connecting groove is the 1/5 ~ 1/2 of annulus body height, and the radial dimension of connecting groove is
0.4mm ~ annulus main body radial thickness 1/2.Under structure design, guarantee that connecting groove has certain volume and do not influence compression ring sheet
The minimum design elastic force of body.
Preferably, the oil return groove depth is greater than 0.4mm and is no more than connecting groove bottom.Structure design guarantees oil return effect
Fruit, it is easy to process and avoid damage to sealing edge.
Preferably, the oil-recovery tank is arc-shaped.Under structure design, arc-shaped oil-recovery tank is designed on compression ring end face
Removal material is few, influences on the fidelity of annulus main body fracture resistance and ring week pressure curve small.
Preferably, the outer circumference surface of the annulus main body is taper, and sealing edge is set to the axial direction of annulus main body outer circumferential sides
Big end position, the corresponding oil-recovery tank are set on the axial large end face of annulus main body, the conical external circle week of the annulus main body
Face cone degree is 0 ~ 10 °, and the height of sealing edge is 0.2mm or more.Under structure design, the outer circumference surface of annulus main body is using cone
Shape increases casing wall pressure on unit area, advantageous frizing, while not pushing away ring because of top air pressure, and sealing weakens.
Preferably, several oil-recovery tanks are equipped in the annulus main body, and the oil-recovery tank gross area is less than, is equal to oil-recovery tank
The half of place annulus main body axial end face area.Under structure design, guarantee the intensity of compression ring.
The present invention also provides the piston components that a kind of compression ring has frizing function, include piston, the outer circumference surface of piston
It is above axially distributed to have at least twice piston groove, compression ring is installed in piston groove, it is characterised in that: be located below position
The compression ring is to scrape gas-oil ring with oil-recovery tank, and scraping gas-oil ring includes the annulus main body with opening, the outer circumference surface of annulus main body
With the sealing edge for contacting sealing cooperation with casing wall, the upper one end adaptable with sealing edge direction of the cylindrical main body axial direction
End face is equipped with the oil-recovery tank radially extended, and the oil-recovery tank is axially toward port and the annulus main body of annulus inner major diameter side
Inner diameter hole connection, oil-recovery tank be axially toward between the port and sealing edge of annulus body outer diameter side be equipped with annular step groove or
The axially extending periphery of the nose-shaped slot of person, step groove or nose-shaped slot is located at internal side diameter, the perforation of oil-recovery tank length direction Single port
The axially extending periphery of step groove constitutes the axial end face edge with step groove perhaps nose-shaped slot connection step groove or nose-shaped slot
Annulus main body is circumferentially continuous, being connected smoothly with sealing edge and then constituting sealing edge circumferentially connects along annulus main body outer circumference surface
It is continuous.
The invention will be further described below in conjunction with the accompanying drawings.
Detailed description of the invention
Fig. 1 is specific embodiment of the invention piston assembly structure schematic diagram；
Fig. 2 is piston gas ring structural schematic diagram of the specific embodiment of the invention with frizing, oil return function；
Fig. 3 is cross-sectional view of the Fig. 2 along A-A cutting line cutting；
Fig. 4 is in Fig. 2 partially along C direction view；
Fig. 5 is piston gas ring perspective view of the specific embodiment of the invention with frizing, oil return function.
Specific embodiment
Referring to attached drawing 1 ~ 5, a kind of piston component disclosed by the invention, including piston 1, the outer circumference surface of piston 1 are equipped with
Piston groove 11 is provided with frizing in piston groove 11, the piston gas ring 2(of oil return function is convenient for narration, by the piston gas
Ring is known as scraping gas-oil ring), piston gas ring 2 includes the annulus main body 21 with opening, and the outer circumference surface of annulus main body 21 has and cylinder
The sealing edge 211 of the contact sealing cooperation of wall 3, the cylindrical main body 21 axial upper adaptable with 211 direction of sealing edge one
End end face is equipped with the oil-recovery tank 212 radially extended, several oil-recovery tanks 212, the oil return are equipped with usually in annulus main body
Slot 212 is axially toward the port 212-1 and 21 inner diameter hole of annulus main body, 210 connection of 21 internal side diameter of annulus main body, oil-recovery tank 212
The port 212-2 for being axially toward 21 outside diameter of annulus main body terminates in the interior radial side of sealing edge 211 and is spaced with sealing edge 211
And then it is circumferentially continuous along the outer circumference surface of annulus main body 21 to constitute sealing edge 211.Oil-recovery tank is radially not passed through annulus main body
Outer circumference surface guarantees the reliability and scraping effect of sealing so that the setting of oil-recovery tank be avoided to destroy the integrality of sealing edge.
Annular is equipped at interval location between the oil-recovery tank 212 and sealing edge 211 is connected groove 213, the rank
213 radially inner side of groove and 212 connection of oil-recovery tank are connect, the outer radial side of connecting groove 213 has circumferentially continuous along annulus main body 21
, being connected smoothly with sealing edge 211 constitutes sealing edge 211 and is connected end face along 21 outer circumference surface of annulus main body is circumferentially continuous
213-1.The design of connecting groove, can be by the connection simultaneously of multiple oil-recovery tanks on sealing edge and annulus main body end face, so that sealing
While the lubricating oil scraped easier can enter in oil-recovery tank, oil return effect is improved, the port of multiple oil-recovery tanks is additionally facilitated
Position control is processed convenient for oil-recovery tank, is formed convenient for the processing of sealing edge.
Further, the connecting groove 213 is cricoid step groove, and the axially extending periphery 213-2 of step groove is located at
Internal side diameter, the axially extending periphery 213-2 that 212 length direction Single port of oil-recovery tank penetrates through step groove 213 is constituted and step groove
The axial end face of 213 connection, step groove 213 constitutes the linking end face 213-1.It is designed using step groove, structure is simple, processing
It is convenient.Certainly as the feasible scheme of the present invention, the annular recess of arc-shaped or rectangle or triangle is also can be used in connecting groove,
The outside diameter of annular recess is connected sealing edge using annular flat face, to guarantee that sealing edge is continuous in annulus main body；Or rank
Access slot 213 is the design of nose-shaped slot, and the axially extending periphery that 212 length direction Single port of oil-recovery tank penetrates through nose-shaped slot constitutes and nose
Shape slot connection, the axial end face of nose-shaped slot constitute the axial end face of the linking i.e. nose-shaped slot of end face 213-1(along annulus main body week
It is connected smoothly to continuous and sealing edge and then composition sealing edge is circumferentially continuous along annulus main body outer circumference surface).
As shown in figure 4, the oil-recovery tank 212 is arc-shaped.Arc-shaped oil-recovery tank design removes material on compression ring end face
Material is few, influences on the fidelity of annulus main body fracture resistance and ring week pressure curve small.Certainly it as the feasible scheme of the present invention, returns
The shape of oil groove can be half rectangle, triangle etc..
In addition, the 212 depth d1 of oil-recovery tank is greater than 0.4mm and is no more than connecting groove bottom.Structure design, oil-recovery tank
212 it is too small do not have oil return effect, be easily destroyed sealing edge more than connecting groove bottom.
The axial dimension of the connecting groove 213 is the 1/5 ~ 1/2 of 21 height of annulus main body, the radial dimension of connecting groove 213
For 0.4mm ~ 21 radial thickness of annulus main body 1/2.Under structure design, guarantee that connecting groove has certain volume and do not influence gas
The minimum design elastic force of ring itself.
212 gross area of oil-recovery tank is less than, equal to the half of 21 place annulus main body axial end face area of oil-recovery tank.The structure
Under design, guarantee the intensity of compression ring.
The outer circumference surface of the annulus main body 21 is taper, forms tapered surface 214, and sealing edge 211 is set to annulus main body 21
The big end position of the axial direction of outer circumferential sides, the corresponding oil-recovery tank 212 are set on the axial large end face of annulus main body 21, the circle
The taper of ring main body 21Outer circleWeekFace cone degree α is 0 ~ 10°, the height H of sealing edge 211 is 0.2mm or more.Outside annulus main body
Periphery uses taper, increases on unit area casing wall pressure, advantageous frizing, while not pushing away ring because of top air pressure, close
Envelope weakens.
For the oil return effect for guaranteeing piston component, the piston groove of the piston ring of frizing function is provided on piston 1
Interior to be equipped with piston oil return hole 12, the radial processing along piston 1 forms piston oil return hole 12, and piston oil return hole 12 is set to piston groove
On the lower position of 11 axially extending anchor ring 11-1, have structure simple, effect easy to process and convenient for oil return.?
Piston groove on piston usually with the installation of multiple tracks compression ring, in the piston groove for being located at the piston ring top position with frizing function
The common compression ring of installation in ditch, common compression ring form initial sealing effect, and the formation of frizing compression ring is again sealed off effect, realizes simultaneously
Scraping effect, to reach the good sealing effect of piston；Gas-oil ring of scraping with oil return function of the invention can be used in piston
Stacking uses in upper two or more piston grooves: a) being made using scrape gas-oil ring and the stacking of common compression ring with oil return function
With；B) gas-oil ring (scheme 1: a piece of common compression ring and a piece of scraping with oil return function is scraped using two panels in a piston groove
Gas-oil ring, scheme 2: two panels scrapes gas-oil ring with oil return function), two panels compression ring opening be staggered 180 degree installation, be more advantageous to sealing
And oil-control.It additionally can be used and common oil-scraping ring etc. mode be set again positioned at frizing compression ring lower position on piston.
The present invention breaks the structure design that traditional compression ring is served only for sealing function, and the frizing of piston ring is concentrated on oil ring and set
Meter opens up oil-recovery tank on compression ring end face, and sealing edge and oil-recovery tank cooperate, and sealing edge passes through back after scraping to the oil on casing wall
The structure design of oil groove reflux, oil-recovery tank has the characteristics that well adapt to compression ring thin structure, the port of the outside diameter of oil-recovery tank
Guarantee the continuous of sealing edge so that the processing of oil-recovery tank be avoided to destroy sealing edge with sealing edge interval, what guarantee compression ring sealed can
By property.Compression ring band oil-recovery tank designs, to expand the structure type of piston component, such as can omit oil ring in some special occasions and set
Meter, so that the application for compression ring and piston provides new thinking.
Claims (10)
1. a kind of piston gas ring with frizing, oil return function, including the annulus main body with opening, the excircle mask of annulus main body
Have the sealing edge that sealing cooperation is contacted with casing wall, it is characterised in that: the cylindrical main body axially it is upper with seal edge direction phase
One end end face of adaptation is equipped with the oil-recovery tank radially extended, and the oil-recovery tank is axially toward the port of annulus inner major diameter side
With annulus inner major diameter hole connection, the port that oil-recovery tank is axially toward annulus body outer diameter side terminates in the interior radial side of sealing edge
And it is circumferentially continuous along the outer circumference surface of annulus main body to constitute sealing edge in turn with sealing edge interval.
2. the piston gas ring with frizing, oil return function according to claim 1, it is characterised in that: the oil-recovery tank and sealing edge it
Between interval location at be equipped with the linking groove of annular, the linking groove radially inner side and oil-recovery tank connection, the outer diameter of connecting groove
To side there is and sealing edge circumferentially continuous along annulus main body to be connected smoothly and constitutes sealing edge along annulus main body outer circumference surface
Circumferentially continuous linking end face.
3. the piston gas ring according to claim 2 with frizing, oil return function, it is characterised in that: the connecting groove is cricoid
Rank slot, the axially extending periphery of step groove are located at internal side diameter, and the axial direction of oil-recovery tank length direction Single port perforation step groove is prolonged
Periphery is stretched to constitute and step groove connection, the axial end face composition linking end face of step groove.
4. the piston gas ring according to claim 2 with frizing, oil return function, it is characterised in that: the axial dimension of the connecting groove
It is the 1/5 ~ 1/2 of annulus body height, the radial dimension of connecting groove is 0.4mm ~ annulus main body radial thickness 1/2.
5. the piston gas ring according to claim 2 with frizing, oil return function, it is characterised in that: the oil return groove depth is greater than
0.4mm and be no more than connecting groove bottom.
6. the piston gas ring with frizing, oil return function according to claim 1, it is characterised in that: the oil-recovery tank is arc-shaped.
7. the piston gas ring with frizing, oil return function according to claim 1, it is characterised in that: the excircle of the annulus main body
Face is taper, and sealing edge is set to the big end position of axial direction of annulus main body outer circumferential sides, and the corresponding oil-recovery tank is set to annulus master
On the axial large end face of body, the conical external circle circumferential surface taper of the annulus main body is 0 ~ 10 °, the height of sealing edge be 0.2mm with
On.
8. the piston gas ring with frizing, oil return function according to claim 1, it is characterised in that: be equipped in the annulus main body
Several oil-recovery tanks, and the oil-recovery tank gross area is less than, equal to the half of annulus main body axial end face area where oil-recovery tank.
It include piston 9. a kind of piston component, it is axially distributed on the outer circumference surface of piston to have an at least twice piston groove, it is living
Compression ring is installed in a plug slot ditch, it is characterised in that: the compression ring for being located below position is to scrape gas-oil ring, frizing with oil-recovery tank
Compression ring includes the annulus main body with opening, and the outer circumference surface of annulus main body has the sealing edge that sealing cooperation is contacted with casing wall, institute
Axially the upper one end end face adaptable with sealing edge direction is equipped with the oil-recovery tank radially extended for the cylindrical main body stated, and described time
Oil groove is axially toward port and the annulus inner major diameter hole connection of annulus inner major diameter side, and oil-recovery tank is axially toward annulus master
Annular step groove is equipped between the port and sealing edge of body outside diameter, and perhaps the axial direction of nose-shaped slot step groove or nose-shaped slot is prolonged
It stretches periphery and is located at internal side diameter, the axially extending periphery that oil-recovery tank length direction Single port penetrates through step groove constitutes and step groove
Perhaps the axial end face of nose-shaped slot connection step groove or nose-shaped slot is circumferentially continuous along annulus main body, seamlessly transits with sealing edge
It connects and then composition sealing edge is circumferentially continuous along annulus main body outer circumference surface.
10. piston component according to claim 9, it is characterised in that: corresponded on the piston and scrape gas-oil ring with oil-recovery tank
Piston groove in be equipped with piston oil return hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811041491.9A CN109253252B (en) | 2018-09-07 | 2018-09-07 | Piston gas ring with oil scraping and oil returning functions and piston assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811041491.9A CN109253252B (en) | 2018-09-07 | 2018-09-07 | Piston gas ring with oil scraping and oil returning functions and piston assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109253252A true CN109253252A (en) | 2019-01-22 |
| CN109253252B CN109253252B (en) | 2020-08-11 |
Family
ID=65047118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811041491.9A Active CN109253252B (en) | 2018-09-07 | 2018-09-07 | Piston gas ring with oil scraping and oil returning functions and piston assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109253252B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11002216B1 (en) | 2020-02-28 | 2021-05-11 | Caterpillar Inc. | Cylinder liner and cylinder liner-piston assembly for abnormal combustion protection in an engine |
| US11187180B2 (en) | 2020-02-28 | 2021-11-30 | Caterpillar Inc. | Abnormal combustion protection in an engine and piston configuration for same |
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| US1735366A (en) * | 1929-04-29 | 1929-11-12 | William E Matthews | Piston ring |
| EP2551504A1 (en) * | 2011-07-25 | 2013-01-30 | Wärtsilä Schweiz AG | Piston and oil distribution ring for a stroke piston combustion engine |
| EP2639438A1 (en) * | 2012-03-13 | 2013-09-18 | Wärtsilä Schweiz AG | Piston and lubricant distribution device for reciprocating piston combustion engine |
| WO2015124163A1 (en) * | 2014-02-24 | 2015-08-27 | Mtu Friedrichshafen Gmbh | Piston ring, cylinder liner and tribological pairing |
| CN105275659A (en) * | 2014-06-06 | 2016-01-27 | 通用电气公司 | Piston assembly for a reciprocating engine |
| CN107218151A (en) * | 2017-06-14 | 2017-09-29 | 华晨汽车集团控股有限公司 | A kind of engine piston assembly |
| CN207333038U (en) * | 2017-06-07 | 2018-05-08 | 华晨汽车集团控股有限公司 | A kind of piston component |
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2018
- 2018-09-07 CN CN201811041491.9A patent/CN109253252B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1735366A (en) * | 1929-04-29 | 1929-11-12 | William E Matthews | Piston ring |
| EP2551504A1 (en) * | 2011-07-25 | 2013-01-30 | Wärtsilä Schweiz AG | Piston and oil distribution ring for a stroke piston combustion engine |
| EP2639438A1 (en) * | 2012-03-13 | 2013-09-18 | Wärtsilä Schweiz AG | Piston and lubricant distribution device for reciprocating piston combustion engine |
| WO2015124163A1 (en) * | 2014-02-24 | 2015-08-27 | Mtu Friedrichshafen Gmbh | Piston ring, cylinder liner and tribological pairing |
| CN105275659A (en) * | 2014-06-06 | 2016-01-27 | 通用电气公司 | Piston assembly for a reciprocating engine |
| CN207333038U (en) * | 2017-06-07 | 2018-05-08 | 华晨汽车集团控股有限公司 | A kind of piston component |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11002216B1 (en) | 2020-02-28 | 2021-05-11 | Caterpillar Inc. | Cylinder liner and cylinder liner-piston assembly for abnormal combustion protection in an engine |
| US11187180B2 (en) | 2020-02-28 | 2021-11-30 | Caterpillar Inc. | Abnormal combustion protection in an engine and piston configuration for same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109253252B (en) | 2020-08-11 |
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